On Thu, May 02, 2024 at 04:23:16PM +0200, Niklas Söderlund wrote:
> Hi Jacopo,
>
> Thanks for your work.
>
> On 2024-04-30 12:39:51 +0200, Jacopo Mondi wrote:
> > Create and initialize the v4l2_subdev_state for the R-Car CSI-2 receiver
> > in order to prepare to support multiplexed transmitters.
> >
> > Create the subdevice state with v4l2_subdev_init_finalize() and
> > implement the init_state() operation to guarantee the state is initialized.
> >
> > The routing table within the R-Car CSI-2 receiver is fixed, streams
> > received on source_stream X will be directed to pad (X + 1) by default.
> > Initialize a static routing table with such routes set as active.
> >
> > While at it, disable runtime_pm() in the probe() function error path.
s/runtime_pm()/runtime PM/
> Can we break this out in a separate patch? As the multiplexed stream
> work will not be ready for v6.10 if I understood the tendencies
> correctly (?), we can at least fix this issue before that.
Agreed, the fix should be a separate patch, with a Fixes: tag.
> > Signed-off-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
> > ---
> > drivers/media/platform/renesas/rcar-csi2.c | 74 +++++++++++++++++++++-
> > 1 file changed, 72 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
> > index 582d5e35db0e..82dc0b92b8d3 100644
> > --- a/drivers/media/platform/renesas/rcar-csi2.c
> > +++ b/drivers/media/platform/renesas/rcar-csi2.c
> > @@ -1226,6 +1226,65 @@ static const struct v4l2_subdev_ops rcar_csi2_subdev_ops = {
> > .pad = &rcar_csi2_pad_ops,
> > };
> >
> > +static int rcsi2_init_state(struct v4l2_subdev *sd,
> > + struct v4l2_subdev_state *state)
> > +{
> > + /*
> > + * Routing is fixed for this device: streams sent on sink_stream X
> > + * are directed to pad (X + 1). Which streams goes to the next
> > + * processing block (VIN) is controlled by link enablement between the
> > + * CSI-2 and the VIN itself and not by the CSI-2 routing table.
> > + *
> > + * The routing table is then fixed, as stream X will be directed to
> > + * csi:(X + 1)/0 and will be transmitted to VINs the on media link
> > + * csi2:(x + 1)->vin:0.
> > + *
> > + * For example, to route stream #3 to VIN #1 : "csi2:4/0 -> vin1:0" and
> > + * to route stream #2 to VIN #4 : "csi2:3/0 -> vin4:0".
> > + */
> > + struct v4l2_subdev_route routes[] = {
> > + {
> > + .sink_pad = RCAR_CSI2_SINK,
> > + .sink_stream = 0,
> > + .source_pad = RCAR_CSI2_SOURCE_VC0,
> > + .source_stream = 0,
> > + .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
> > + },
> > + {
> > + .sink_pad = RCAR_CSI2_SINK,
> > + .sink_stream = 1,
> > + .source_pad = RCAR_CSI2_SOURCE_VC1,
> > + .source_stream = 0,
> > + .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
> > + },
> > + {
> > + .sink_pad = RCAR_CSI2_SINK,
> > + .sink_stream = 2,
> > + .source_pad = RCAR_CSI2_SOURCE_VC2,
> > + .source_stream = 0,
> > + .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
> > + },
> > + {
> > + .sink_pad = RCAR_CSI2_SINK,
> > + .sink_stream = 3,
> > + .source_pad = RCAR_CSI2_SOURCE_VC3,
> > + .source_stream = 0,
> > + .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE,
> > + },
> > + };
> > +
> > + struct v4l2_subdev_krouting routing = {
> > + .num_routes = ARRAY_SIZE(routes),
> > + .routes = routes,
> > + };
>
> Should not the two structs above be static const as you return a pointer
> to them?
v4l2_subdev_set_routing() takes a non-const v4l2_subdev_krouting
argument. Unless I'm missing something, this function doesn't return a
pointer to the local structures.
> > +
> > + return v4l2_subdev_set_routing(sd, state, &routing);
> > +}
> > +
> > +static const struct v4l2_subdev_internal_ops rcar_csi2_internal_ops = {
> > + .init_state = rcsi2_init_state,
> > +};
> > +
> > static irqreturn_t rcsi2_irq(int irq, void *data)
> > {
> > struct rcar_csi2 *priv = data;
> > @@ -1887,11 +1946,13 @@ static int rcsi2_probe(struct platform_device *pdev)
> >
> > priv->subdev.owner = THIS_MODULE;
> > priv->subdev.dev = &pdev->dev;
> > + priv->subdev.internal_ops = &rcar_csi2_internal_ops;
> > v4l2_subdev_init(&priv->subdev, &rcar_csi2_subdev_ops);
> > v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
> > snprintf(priv->subdev.name, sizeof(priv->subdev.name), "%s %s",
> > KBUILD_MODNAME, dev_name(&pdev->dev));
> > - priv->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
> > + priv->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE |
> > + V4L2_SUBDEV_FL_STREAMS;
> >
> > priv->subdev.entity.function = MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER;
> > priv->subdev.entity.ops = &rcar_csi2_entity_ops;
> > @@ -1912,14 +1973,22 @@ static int rcsi2_probe(struct platform_device *pdev)
> >
> > pm_runtime_enable(&pdev->dev);
> >
> > + ret = v4l2_subdev_init_finalize(&priv->subdev);
> > + if (ret)
> > + goto error_pm_runtime;
> > +
> > ret = v4l2_async_register_subdev(&priv->subdev);
> > if (ret < 0)
> > - goto error_async;
> > + goto error_subdev;
> >
> > dev_info(priv->dev, "%d lanes found\n", priv->lanes);
> >
> > return 0;
> >
> > +error_subdev:
> > + v4l2_subdev_cleanup(&priv->subdev);
> > +error_pm_runtime:
> > + pm_runtime_disable(&pdev->dev);
> > error_async:
> > v4l2_async_nf_unregister(&priv->notifier);
> > v4l2_async_nf_cleanup(&priv->notifier);
> > @@ -1936,6 +2005,7 @@ static void rcsi2_remove(struct platform_device *pdev)
> > v4l2_async_nf_unregister(&priv->notifier);
> > v4l2_async_nf_cleanup(&priv->notifier);
> > v4l2_async_unregister_subdev(&priv->subdev);
> > + v4l2_subdev_cleanup(&priv->subdev);
> >
> > pm_runtime_disable(&pdev->dev);
> >
--
Regards,
Laurent Pinchart
